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Yoke-type magnetic head and magnetic disk apparatus

A technology of a magnetic disk device and a magnetic yoke, which can be used in the direction of synthesizing magnetic core magnetic heads, manufacturing magnetic flux sensitive magnetic heads, measuring devices, etc., and can solve problems such as difficult signals

Inactive Publication Date: 2008-01-02
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is a problem that it is difficult for the yoke type head to determine the signal due to Barkhausen noise.

Method used

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  • Yoke-type magnetic head and magnetic disk apparatus
  • Yoke-type magnetic head and magnetic disk apparatus
  • Yoke-type magnetic head and magnetic disk apparatus

Examples

Experimental program
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Effect test

no. 1 example

[0024] The configuration of a yoke type reproducing head according to a first embodiment of the present invention will be described with reference to FIGS. 1 , 2 and 3 . FIG. 1 is a schematic diagram showing a magnetic head according to a first embodiment of the present invention. In addition, FIG. 2 is a perspective view showing the configuration of the magnetic head. FIG. 3 is a cross-sectional view of the magnetic head shown in FIG. 2 cut along line II-II. In FIG. 2 the air bearing surface (ABS) is shown in cross section on the front side in said figure.

[0025] As shown in FIG. 1 , main magnetic poles 5A and 5B that cause a signal magnetic field from the medium in the magnetoresistance effect film, main magnetic poles 5A and 5B for returning to flow into the main magnetic poles are formed on a plane perpendicular to the linear recording direction of the medium. The sub-yoke 6 and the side shielding part 10 of the magnetic field. That is, sub-yoke 6 is formed in the off...

no. 2 example

[0056] The second embodiment of the present invention has a structure in which a side shield member is formed only on one side of the main magnetic pole, as shown in FIG. 12 . Also in this case, compared with the structure shown in FIG. 1, there is a lower degree of freedom in design, but almost equivalent effects can be obtained.

no. 3 example

[0058] A third embodiment of the present invention is characterized in that the main magnetic pole itself is constituted by the magnetization free layer of the magnetoresistance effect film in FIG. 5 . In this way, the head flow efficiency can be further improved. In this case, the rear part of the main pole may adjoin another magnetic layer and be bonded to said other magnetic layer, or the entire main pole may do so, as long as the return yoke can consist of a magnetization free layer. In addition, this structure can be applied to the structure shown in FIGS. 6A and 6B , or an advantageous effect can be obtained by the structure shown in FIG. 7 .

[0059] In the example shown above, the structure in which the side shield members are formed on the side surfaces of the main magnetic poles 5A and 5B is shown. However, as shown in FIG. 13, the side shield member may not be formed.

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Abstract

According to one embodiment, a yoke-type magnetic head for reading out magnetic information from a medium in which information is magnetically recorded in a track direction, the head includes a magnetic pole which is provided on a plane perpendicular to a linear recording direction and has an opposing surface facing the medium, a saturation magnetic flux density Bs 1 , and a volume V 1 , a sub yoke which is formed on the plane by being connected to the magnetic pole, and has a length SYW in a direction perpendicular to the linear recording direction longer than a length SYH in a direction perpendicular to a surface of the medium, and a saturation magnetic flux density Bs 2 and a volume V 2 , the product Bs 2 V 2 of which is larger than the product Bs 1 V 1 , and a magnetoresistance effect film which is formed between the sub yoke and the opposing surface, and abuts the magnetic pole.

Description

technical field [0001] One embodiment of the present invention relates to a yoke type magnetic head and a magnetic disk device thereof. Background technique [0002] Next-generation magnetoresistance effect elements face problems such as narrowed gaps and soft magnetic properties of the free layer while the resistance change rate has been improved. In order to solve these problems, a yoke type magnetic head has been proposed (Japanese Patent Application Laid-Open No. 2001-256608). [0003] However, there is a problem that the yoke type magnetic head has difficulty in determining a signal due to Barkhausen noise. Contents of the invention [0004] SUMMARY OF THE INVENTION It is an object of the present invention to provide a yoke type magnetic head and magnetic disk device capable of suppressing Barkhausen noise. [0005] According to one aspect of the present invention, there is provided a yoke type magnetic head for reading magnetic information from a medium in which in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/39
CPCH01L43/08G01R33/093G11B5/1276G11B2005/0002B82Y25/00G11B5/02G11B5/39H10N50/10
Inventor 鸿井克彦
Owner KK TOSHIBA
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